Air cooling of the cylinders of internal combustion engines



G.CATTANEO f Feb. 2, 1932.

AIR COOLING OF THE CYLINDERS OF INTERNAL COMBUSTION ENGINES .3 Sheets-Sheet 1 Filed March 28, 1928 "Feb.2,1932., 1 G. CA'II'TANEO 1,843,801

AIR COOLING 3F THE- CYLINDERS OF INTERNAL COMBUSTION ENGINES Filed March 28-, 1928 a. Shee ts-Sheet 2 Feb. 2, 1932. CAT AN 1,843,801

AIR COOLING OF THE CYLINDERS OF INTERNAL COMBUSTION ENGINES Filed March 28, 1928 S Sheets-Sheet 5 6 faziam o Patented Feb. 2, 1932 'EJNITED STATES PATENT OFFICE.

GIUST'INO CATTANEO, OF MILAN, ITALY AIR COOLING OF THE CYLINDERS OF INTERNAL COMBUSTION ENGINES Application filed March 28, 1928, Serial No. 265,486, and in Italy March 28, 1927.

contact with the cooling ribs of the preced-- ing cylinders. The consequence is that the creases as they are farther away from the foremost cylinder and may attain values that may render the running of the'engines difficult or even impossible owing to the loss of viscosity or owing to the combustion of the lubricating oil, both of which inconveniences entail friction, wear and seizing of the pistons and breakages of the valves and especially of the exhaust valves which become overheated.

The object of the present invention is to secure, in the engines having their cylinders arranged in star or fan form with large front surface, a uniform cooling for each cylinder by supplying to each of them an appropriate amount of air at the same temperature, the air being conveyed to each cylinder independently from the other cylinders through separate ducts, so that it reaches the individual cylinder to which it is destined and is guided at will during its travel.

The accompanying drawings illustrate the invention as applied to a 12 cylinder engine, the cylinders being arranged in tworows of six cylinders each forming a V of 60 opening and being provided with the usual cooling ribs. It will be noticed that. as far as the cooling is concerned, each cylinder row is completely independent, so that the system is'applicable to engines having any numher of cylinder rows.

Fig.. 1 is a front elevation of an internal 50 combustion engine illustrating the invention applied thereto.

' temperature of the various cylinders in-- tion thereof and as uniformly as practicable.

'conduit and dividing the-latter into a. plural- Fig. 2 is a diagrammatic horizontal sectional view of Fig. 1 showing the arrangement and location of the partitions dividing the air conduit into a plurality of channels for directing the cooling air.

Figs. 3 and 4 are views corresponding to Figs. 1 and 2 and showing a modification of the invention.

With reference to Figs. 1 and 2, the numerals 1, 2, 3, etc. indicate the cylinders, which are shown in section. v

The arrow F indicates the direction of the cooling air current, which may be generated either by an ordinary fan or by the travelling motion of the engine in the surrounding air, as is the case on an aeroplane. The front section of the air current is divided into several streams by the partition walls or guides A, B, C, D, etc. made of sheet metal or other suitable sheet material. These secondary streams of appropriate sec tion are each so guided as to strike the cooling ribs and external surface of the respective cylinder and to act on as greata por- Whilst in Figs. 1 and 2 the said partition walls are located inside of the V, in Figs. 3 and 4 they are located outside of it.

In this manner all cylinders find themselves,'in respect to cooling, in the same conditions as the foremost cylinder 1. This will ensure a uniform temperature in all cylinders, because all of them will receive the same amount of air at a uniform initial temperature and under the same inlet and outlet con- 85 'ditions. The current of air, lying outside of the V in the case of Figs. 1 and 2 and lying inside the V in the case of Figs. 3 and 4, will cause a depression at S and therewith assist .in sucking in air.

along the sidewalls of the cylinders of each 'row and having an air inlet at its forward end,

a plurality ofpartitions arranged in each ity of channels, said partitions extending laterally between the rows and terminating in parallel relation to the side walls of adjacent cylinders in the same row and defining outlets for the air disposed in proximity to the side walls of the cylinders.

Signed at Milan (Italy), this th day of F eb., 1928.

GIUSTINO CATTANEO. 

